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Reports calls to <code>toString()</code> in string templates that can be safely removed.
<p><b>Example:</b></p>
<pre><code>  fun foo(a: Int, b: Int) = a + b

  fun test(): String {
      return "Foo: ${foo(0, 4).toString()}" // 'toString()' is redundant
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>  fun foo(a: Int, b: Int) = a + b

  fun test(): String {
      return "Foo: ${foo(0, 4)}"
  }
</code></pre>
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